Electronics Letters
Electronics Letters > 1989 > 25 > 4 > 281 - 282
Electronics Letters > 1989 > 25 > 19 > 1286 - 1288
Electronics Letters > 1989 > 25 > 20 > 1394 - 1396
Electronics Letters > 1990 > 26 > 9 > 572 - 573
Electronics Letters > 1992 > 28 > 10 > 898 - 900
Electronics Letters > 1992 > 28 > 12 > 1131 - 1133